Etymograph

English

rotary

Rotary comes from Medieval Latin rotarius ‘a wheelwright, wheeler’, and goes back to Proto-Indo-European *Hreth₂- ‘to run, roll’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*Hreth₂-1‘to run, roll’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*Hróth₂-eh₂1reconstructed
  3. Proto-Italicc. 1500–700 BCE*rotā1reconstructed
  4. Latinc. 75 BCE–200 CErota2‘wheel’
  5. Medieval Latinc. 600–1500rotarius2‘a wheelwright, wheeler’
  6. Englishearliest quotation 1997rotary2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin rota
  2. 2 Wiktionary, English rotary
  3. Earliest quotation in Wiktionary’s entry: 1997, A. J. Taylor, D. S. Mothram: “Volatiles of kecap manis and its raw materials were…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*Hreth₂-Wiktionary, Latin rota‘to run, roll’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*Hróth₂-eh₂Wiktionary, Latin rotareconstructed
  3. Proto-Italicc. 1500–700 BCE*rotāWiktionary, Latin rotareconstructed
  4. Latinc. 75 BCE–200 CErotaWiktionary, English rotary‘wheel’
  5. Medieval Latinc. 600–1500rotariusWiktionary, English rotary‘a wheelwright, wheeler’
  6. Englishearliest quotation 1997rotaryWiktionary, English rotary. Earliest quotation in Wiktionary’s entry: 1997, A. J. Taylor, D. S. Mothram: “Volatiles of kecap manis and its raw materials were…”

The story

Attested mid 18th century, from Medieval Latin rotarius, from Latin rota (‘wheel’).

Full etymology on Wiktionary

Linked words

through Proto-Indo-European *Hreth₂- ‘to run, roll’

rash, rotate, 15 more

through Latin rota ‘wheel’

roll, rotation, rodeo, rueda, rotund, rotavirus, 13 more

Today it means

adj Capable of rotation.

Sources

Sources: Wiktionary, “rotary”; the older steps come from the Wiktionary entry for Latin rota. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *Hreth₂- / rotary

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